JP6985542B1 - Insert products and their manufacturing methods - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress or control deformation of a cooling pipe during insert molding. SOLUTION: In the method of manufacturing an insert product 100, a step of filling a cooling pipe 10 with a filling 40 and a step of integrating a cooling pipe 10 filled with the filling 40 and a heating element 20 by insert molding. including. By performing insert molding with the filler 40 filled in the cooling pipe 10, it is possible to suppress or control the deformation of the cooling pipe 10 due to the injection pressure of the resin. [Selection diagram] Fig. 3

Description

The present invention relates to an insert product in which a heating element and a pipe for cooling the heating element are integrated with a resin, and a method for manufacturing the same.

Conventionally, a device for cooling a heating element such as a bus bar has been known. For example, Patent Document 1 discloses a cooling device having a structure in which one end of a heat transfer body is connected to a cooler such as a heat sink or a heat pipe, and the other end of the heat transfer body is connected to a heat generating body. There is. In the cooling device described in Patent Document 1, a cooler and a heating element are fastened to the heat transfer body by using bolts and nuts.

Further, Patent Document 2 discloses an electronic component mounting module in which a bus bar, a capacitor, and a heat sink are molded with a resin (paragraphs 0040 to 0042).

Japanese Unexamined Patent Publication No. 2015-084609 Japanese Unexamined Patent Publication No. 2019-21747

By the way, as in the case of the cooling device described in Patent Document 1, it is assumed that a heating element, a heat transfer element, and a cooler are prepared as separate parts and assembled by fasteners of bolts and nuts. In addition to the cost of assembling them, there is a problem that the cooling efficiency is lowered because it becomes difficult to efficiently transfer heat from the heating element to the cooler. Therefore, in order to reduce the assembly cost and improve the cooling efficiency, the bus bar (heating element) and the heat sink (cooler) are integrated by molding with a resin as in the technique described in Patent Document 2. Is also considered to be effective.

However, since the heat sink generally cools the object by arranging a large number of fins to increase the surface area, its shape is limited and its use is also limited to air cooling. On the other hand, the cooling pipe can be used not only for air cooling but also for water cooling and oil cooling, and its shape can be freely deformed to some extent. Therefore, the heat sink has a problem that the cooling performance and versatility are inferior to those of the cooling pipe.

Therefore, it is conceivable to adopt a cooling pipe instead of the bus bar described in Patent Document 2 and to mold the cooling pipe and the bus bar with a resin. However, when the cooling pipe and the bus bar are arranged in the mold and a resin with high heat is injected into the mold to integrate the cooling pipe and the bus bar, the injection pressure of the resin causes the cooling pipe to be integrated. A new problem arises in which is deformed. For this reason, it has been considered impossible in the past to integrate a heating element such as a bus bar and a cooling pipe with a resin.

The present invention has been made in view of the above problems, and in an insert product in which a heating element and a cooling pipe are integrated with a resin and a method for manufacturing the same, deformation of the cooling pipe during insert molding is suppressed or controlled. The main purpose is that.

As a result of diligent studies on means for solving the above-mentioned problems of the prior art, the inventors of the present invention fill the cooling pipe with a filling material when the heating element and the cooling pipe are integrated by insert molding. It was found that the deformation of the cooling pipe caused by the injection pressure of the resin can be suppressed or controlled by keeping it. Then, the present inventors have come up with the idea that the problems of the conventional invention can be solved based on the above findings, and have completed the present invention. Specifically, the present invention has the following steps or configurations.

The first aspect of the present invention relates to a method for manufacturing an insert product. The method for manufacturing an insert product according to the present invention includes a step of filling a cooling pipe with a filling, and a step of integrating the cooling pipe filled with the filling and a heating element by insert molding. In the present invention, the "filler" may be solid (particulate or powdery), gel-like, or liquid as long as it has fluidity. Further, as the filling material, a mixture of two or more of solid, gel, and liquid can also be used. A "cooling pipe" is a cylindrical member with both ends open or a bottomed tubular member with one end open and the other end closed. The cooling pipe can be used for air cooling, water cooling, and oil cooling, and by circulating gas, liquid, and / or oil inside the cooling pipe, heat is taken from the heating element and released to the outside. The shape of the cooling pipe is not particularly limited, and a linear one or an appropriately curved shape can be used. Further, the cross-sectional shape of the cooling pipe may be a triangle, a quadrangle, or another polygon in addition to a circle, or may be a cross-sectional shape in which a circular shape and a polygon are partially combined. An example of a "heat generator" is a conductive bus bar that constitutes an electronic device (power module or the like) that handles a large current. However, the heating element is not limited to the bus bar, and any heating element that requires cooling can be used. "Insert molding" (injection molding) is to inject a molten resin into a mold in which a cooling pipe and a heating element are placed, and then solidify the resin to integrate the cooling pipe and the heating element with this resin. Means a process. As the resin, it is preferable to select a material having insulating properties and heat transfer properties. However, if the heating element or the cooling pipe is not conductive, the resin does not have to be insulating. Further, if the heating element or the cooling pipe is non-conductive, the two are not energized, so that they can be integrated with the resin in a state of being in close contact with each other. When the heating element and the cooling pipe are in close contact with each other in this way, the resin does not have to have heat transfer properties. Further, insert molding can be performed by interposing a heat radiating material or an insulating material in addition to the injection resin between the heating element and the cooling pipe.

As described above, by integrating the cooling pipe and the heating element by insert molding while the cooling pipe is filled with the filler, it is possible to suppress the deformation of the cooling pipe due to the injection pressure of the resin. If the deformation of the cooling pipe is acceptable, it is also possible to control the deformation amount and the deformation shape of the cooling pipe by adjusting the size, shape, and amount of the filling material.

In the method for producing an insert product according to the present invention, the filler preferably contains solid particles. For example, when the filling is liquid, when high-temperature resin is injected, the filling in the cooling pipe evaporates, and the expansion pressure causes the cap provided at the entrance and exit of the cooling pipe to come off, or the cooling pipe to be deformed. There is also a risk of it. In this respect, solid particles have a low coefficient of thermal expansion and are suitable for filling in a cooling pipe.

In the method for producing an insert product according to the present invention, the filler is preferably spherical solid particles. Since the filling has a spherical shape, even if the shape of the cooling pipe is complicated, it becomes easy to fill the filling without gaps inside the cooling pipe, and it becomes easy to discharge the filling from the inside of the cooling pipe after insert molding. Further, as the spherical filling, one having a large diameter and one having a small diameter can be used in combination.

In the method for producing an insert product according to the present invention, the solid particles are preferably made of ceramic or metal. The filler (solid particles) used in the present invention is required to have rigidity that can withstand the injection pressure of the resin. For example, if glass particles are used as the solid particles, the solid particles may be damaged in the cooling pipe during insert molding. In this respect, if it is made of ceramic or metal, it has an appropriate rigidity that can withstand the injection pressure of the resin, and is also advantageous in terms of cost. In particular, it is preferable to use zirconia as the ceramic, and it is preferable to use stainless steel as the metal.

In the method for manufacturing an insert product according to the present invention, it is preferable to further include a step of applying vibration to the cooling pipe after the step of filling the cooling pipe with the filler and before the step of integrating by insert molding. Since the cooling pipe is filled with a filling material, by applying vibration to the cooling pipe, the filling material is dispersed in the cooling pipe and the filling material is distributed to every corner of the inside. Can be done.

A second aspect of the present invention relates to an insert product. The insert product according to the present invention has a cooling pipe, a heating element, and a resin that integrally binds the cooling pipe and the heating element. Conventionally, it has been considered impossible to integrate a cooling pipe and a heating element by insert molding because the cooling pipe is deformed. However, according to the present invention, as described above, the cooling pipe and the heating element generate heat. An insert product in which the body and the body are integrally bonded with a resin can be easily manufactured.

In the insert product according to the present invention, it is preferable that a plurality of recesses are formed on the outer wall surface of the cooling pipe, and the resin is in close contact with the recesses. In the present invention, it is recommended to perform insert molding in a state where the cooling pipe is filled with a filler, but when solid particles are used as the filler, the injection pressure of the resin causes the outer peripheral surface of the cooling pipe to be subjected to insert molding. Recesses are formed along the gaps between the solid particles. By forming the recesses within an acceptable range in this way, the surface area of the outer peripheral surface of the cooling pipe is increased, and it is expected that the cooling efficiency will be improved. Further, since this recess is formed by the injection pressure of the resin, the resin is in close contact with the recess. The cooling efficiency of the cooling pipe can also be improved by bringing the resin into close contact with the recess in this way.

According to the present invention, it is possible to provide an insert product in which a heating element and a cooling pipe are integrated with a resin. Further, according to the present invention, it is possible to suppress or control the deformation of the cooling pipe during insert molding.

FIG. 1 is a plan view schematically showing an insert product according to the first embodiment of the present invention. FIG. 2 shows the cross-sectional structure of the line II-II shown in FIG. FIG. 3 shows an example of a method for manufacturing an insert product. FIG. 4 schematically shows a state in which the cooling pipe is deformed by the injection pressure of the resin. FIG. 5 shows a cross-sectional structure of an insert product according to a second embodiment of the present invention. FIG. 6 shows a cross-sectional structure of an insert product according to a third embodiment of the present invention. FIG. 7 shows a plan view and a cross-sectional structure of the insert product according to the fourth embodiment of the present invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the forms described below, and includes those appropriately modified from the following forms to the extent apparent to those skilled in the art.

The present invention relates to an insert product and a method for manufacturing the same. 1 and 2 show the insert product 100 according to the first embodiment of the present invention. As shown in these figures, the insert product 100 is basically composed of a cooling pipe 10, a heating element 20, and a resin layer 30. That is, in the insert product 100 according to the present invention, the heating element 20 and the cooling pipe 10 for cooling the heating element 20 are integrated by the resin layer 30.

Examples of the insert product 100 are electronic devices such as power modules, inverters, converters, motors, or lithium-ion batteries, or peripheral devices thereof. However, the application examples of the insert product according to the present invention are not limited to those listed here, and other products having a heating element 20 and aiming to effectively cool the heat thereof are targeted. Can be done.

The cooling pipe 10 is a tubular or bottomed tubular member embedded in the resin layer 30. In the present embodiment, as the cooling pipe 10, a cylindrical (bottomless) one having both ends open is adopted. Heat is taken from the heating element 20 by injecting a heat medium such as gas, water or oil into the cooling pipe 10 and circulating the heat medium. As the cooling pipe 10, a known metal or resin can be used as long as it has heat transfer properties. Further, in the embodiment shown in FIGS. 1 and 2, the cooling pipe 10 has a circular cross section (regular circular shape). However, the cross-sectional shape of the cooling pipe 10 is not limited to this, and may be an ellipse, a triangle, a quadrangle, or another polygon. In the present embodiment, the cooling pipe 10 is molded into a meandering curved shape. By forming the cooling pipe 10 in a curved shape so as to have a plurality of folding points in this way, the cooling pipe 10 can be compactly housed in the insert product 100.

Further, the cooling pipe 10 has a buried portion 11 embedded in the resin layer 30 and an extended portion 12 not embedded in the resin layer 30. In the present embodiment, both ends of the cooling pipe 10 are extended portions 12, and the other portions are buried portions 11. Therefore, the heat medium can be injected from one end of the cooling pipe 10 and discharged from the other end. Further, as will be described in detail later, by extending a part of the cooling pipe 10 to the outside of the resin layer 30, insert molding can be performed while the extending portion 12 is held by the mold. ..

The heating element 20 is embedded in the resin layer 30 together with the cooling pipe 10. In the present embodiment, the heating element 20 uses a plate-shaped member, but the shape thereof is not particularly limited. An example of the heating element 20 is an electrode such as a bus bar having conductivity. The heat generated by energizing the heating element 20 can be dissipated by the cooling pipe 10. Therefore, the heating element 20 is preferably made of a conductive metal material. Further, as shown in FIG. 2, in the present embodiment, from the viewpoint of efficiently dissipating heat, one side of the heating element 20 is exposed from the resin layer 30, and the other side is exposed by the resin layer 30. It is embedded in the resin layer 30 so as to be covered. However, it is also possible to cover both sides of the heating element 20 with the resin layer 30.

Further, the heating element 20 also has a buried portion 21 embedded in the resin layer 30 and an extended portion 22 not embedded in the resin layer 30. Further, in the present embodiment, an opening 23 is formed in the extending portion 22 of the heating element 20. The extending portion 22 of the heating element 20 can be used as a terminal for energizing the heating element 20. Further, by extending a part of the heating element 20 to the outside of the resin layer 30, insert molding can be performed while the extending portion 22 is held by the mold.

Further, as shown in FIG. 2, the heating element 20 preferably has holes 24 at one or a plurality of locations. That is, in the present embodiment, as described above, since one side of the heating element 20 is exposed from the resin layer 30, there is a concern that the binding strength between the heating element 20 and the resin layer 30 may be weakened. Further, in the present embodiment, a gap is provided between the cooling pipe 10 and the heating element 20, but there is also a problem that it is difficult to appropriately penetrate the molten resin into the gap. Therefore, by forming a hole 24 in the heating element 20 and allowing the molten resin to penetrate through the hole 24, the gap between the cooling pipe 10 and the heating element 20 is appropriately filled with the resin, and the heating element 20 is formed. And the binding strength of the resin layer 30 is improved. From the viewpoint of improving the binding strength between the heating element 20 and the resin layer 30, a recess (not shown) is formed on the surface of the heating element 20 on the resin layer 30 side instead of the hole 24, and the recess is formed. It is also possible to adopt a configuration in which the resin layer 30 is brought into close contact with the inside. Further, the hole portion 24 and the recessed portion can be used together.

The resin layer 30 is a bonding material for integrating the cooling pipe 10 and the heating element 20. The resin layer 30 may be either a thermoplastic resin or a thermosetting resin, but it is preferable to use a thermoplastic resin in consideration of convenience at the time of insert molding. Examples of thermoplastic resins are PBT (polybutylene terephthalate), PPS (polyphenylene terephthalate), polyethylene terephthalate (PET), nylon, polypropylene, polyethylene, and ABS resins. Examples of thermosetting resins are phenolic resins, epoxy resins, melamine resins, polyesters, and diallyl phthalates. However, the thermoplastic resin and the thermosetting resin are not limited to those listed here, and other known resins can be used.

Further, as the resin layer 30, it is preferable to use a resin having heat transfer property and insulating property. Since the resin layer 30 has heat transfer properties, the heat conduction efficiency from the heating element 20 to the cooling pipe 10 can be improved. Further, since the resin layer 30 has heat transfer properties, heat is dissipated from the heating element 20 via the resin layer 30, so that the cooling effect of the entire insert product 100 can be enhanced. Further, since the resin layer 30 has an insulating property, even when the cooling pipe 10 and the heating element 20 are both formed of a conductive material, the resin layer 30 can insulate between them. However, for example, when the cooling pipe 10 and the heating element 20 are in direct contact with each other, the resin layer 30 does not necessarily have to be a heat transfer material. Further, for example, when either the cooling pipe 10 or the heating element 20 is made of a non-conductive material, the resin layer 30 does not necessarily have to be an insulating material.

Subsequently, a method for manufacturing the above-mentioned insert product 100 will be described with reference to FIG. First, in the manufacturing method according to the present invention, as shown in FIG. 3A, the cooling pipe 10 is filled with the filler 40. In the present embodiment, spherical solid particles are used as the filler 40. The filling 40 (solid particles) is prepared in an amount sufficient to fill the cavity in the cooling pipe 10.

As the filler 40, it is preferable to use solid particles made of ceramic or metal. As the ceramic filler 40, materials such as zirconia, alumina, and silicon nitride are preferably used, and these may be used alone or in combination as appropriate depending on the intended use. Among these ceramic materials, zirconia is particularly excellent in strength, so that the main component of the filler 40 is preferably zirconia. In particular, it is particularly preferable that the filling 40 has a zirconia ratio of 90% by weight or more of all the components from the viewpoint of obtaining suitable strength. Further, as the metal filling 40, it is preferable to use materials such as stainless steel, titanium, aluminum, magnesium, iron, steel, copper, lead, and zinc. Among these metal materials, stainless steel is particularly excellent in strength, so when the filler 40 is made of metal, it is preferable to use stainless steel. Further, the plurality of fillers 40 do not necessarily have to be composed of one kind of material, and the fillers 40 made of a material selected from the above-mentioned ceramic material and metal material can be appropriately mixed and used. ..

When the filler 40 is a spherical solid particle, its diameter is preferably 0.5 mm or more and 1.0 mm or less, and is 0.6 to 0.9 mm or 0.7 to 0.8 mm. Is particularly preferable. If the diameter of the solid particles is less than 0.5 mm, it may be difficult to handle the solid particles, for example, depending on the material forming the solid particles, it may be difficult to dissociate from each other due to static electricity. On the other hand, if the diameter of the solid particles exceeds 1.0 mm, the gap between the solid particles filled in the cooling pipe 10 becomes large, and there is a concern that the deformation suppressing effect of the cooling pipe 10 is diminished. Therefore, it is appropriate that the diameter of the solid particles is in the above range. In the present invention, a large number of solid particles are used, and it is sufficient that the average particle diameter of such solid particles is within the above range. The "average particle size" means a mode diameter which is the most frequent particle size in the particle size distribution. The particle size distribution can be measured by, for example, an image analysis method, a Coulter method, a sieving method, a centrifugal sedimentation method, or a laser diffraction / scattering method. Of these, in the present specification, the particle size distribution is measured according to JIS Z8827-1: 2018 "Particle size analysis-image analysis method-Part 1: static image analysis method".

When the packing 40 is a spherical solid particle, the diameter of each particle can be unified, or solid particles having various diameters can be mixed. Further, as the packing 40, spherical solid particles and non-spherical solid particles can be mixed and used. Further, as the filling 40, it is also possible to fill the cooling pipe 10 with a liquid and / or gel-like fluid together with the solid particles.

Further, after filling the cooling pipe 10 with the filling 40, it is preferable to give vibration to the cooling pipe 10 so that the filling 40 is sufficiently filled in the cooling pipe 10 without any gaps. A known vibrator can be used in the step of applying vibration to the cooling pipe 10. Further, it is preferable to check whether the filling 40 is sufficiently filled in the cooling pipe 10. Specifically, a sample in a state in which the filling 40 is sufficiently filled in a certain cooling pipe 10 is prepared, and the weight of this sample is measured in advance to set a predetermined weight threshold value. Then, when the filling 40 is filled into another cooling pipe 10, the weight of the cooling pipe 10 after filling is measured, and whether the weight reaches the threshold value set as described above. Just check. Specifically, it is preferable to control the weight of the cooling pipe 10 in units of 1 g after filling the filler 40.

Next, as shown in FIG. 3B, the open end of the cooling pipe 10 filled with the filling 40 is temporarily sealed by the cap 230. Further, a part of the cooling pipe 10 and the heating element 20 are arranged inside the cavity formed by the first mold 210 and the second mold 220. At this time, regarding the cooling pipe 10, the end portion thereof and the cap 230 are arranged outside both the molds 210 and 220. Further, it is preferable to hold a part of the cooling pipe 10 by the molds 210 and 220 so that the cooling pipe 10 does not come into contact with the molds 210 and 220 in the cavity. On the other hand, the heating element 20 is arranged in the cavity so that one side thereof is in contact with the second mold 220. The heating element 20 is fixed so that its extending portion 22 (see FIG. 1) is sandwiched between both molds 210 and 220.

In this embodiment, as shown in FIG. 3B, the cooling pipe 10 and the heating element 20 are held in a non-contact state in the cavity formed by the two molds 210 and 220. Then, as will be described later, a molten resin having an insulating property is filled between the cooling pipe 10 and the heating element 20. As a result, even when the cooling pipe 10 and the heating element 20 are made of a conductive material, the insulating state of both can be maintained.

Next, as shown in FIG. 3C, the molten resin for forming the resin layer 30 is injected into the cavity through the gate 211 formed in the first mold 210. As the molten resin, a thermoplastic resin is generally used. In this case, the molten resin injected into the cavity is in a high temperature state. By injecting the molten resin into the cavity in this way, the resin is filled around the cooling pipe 10 and the heating element 20 and between them. In this injection step, there is a concern that the cooling pipe 10 may be deformed due to the injection pressure of the resin with high heat. However, in the present invention, the cooling pipe 10 is sufficiently filled with the filler 40 for cooling. Deformation of the pipe 10 is suppressed to a minimum. Alternatively, the amount of deformation of the cooling pipe 10 can be controlled within an allowable range. Then, the molten resin is solidified in the cavity. When a thermoplastic resin is used as the resin, the molten resin may be cooled in the mold. When a thermosetting resin is used as the resin, the molten resin may be heated in the mold.

Next, as shown in FIG. 3D, the resin layer 30 is formed by solidifying the resin. As a result, the insert product 100 in which the cooling pipe 10 and the heating element 20 are integrated is obtained by the resin layer 30. After the resin has solidified, the first mold 210, the second mold 220, and the cap 230 are appropriately removed. Further, the filling 40 can be recovered from the inside of the cooling pipe 10. The filler 40 can basically be recovered and reused as long as it is not damaged or the like. Further, since foreign matter may be attached or mixed in the filling material 40 taken out from the cooling pipe 10, it is preferable to remove such foreign matter when the filling material 40 is reused.

Subsequently, with reference to FIG. 4, the characteristics of the cooling pipe 10 in the insert product 100 obtained by the above step will be described. FIG. 4 is an enlarged view schematically showing the cooling pipe 10 in the insert product 100. Further, in FIG. 4, a part of the filler 40 filled in the cooling pipe 10 at the time of insert molding is shown by a dotted line. As shown in FIG. 4, a large pressure is applied to the cooling pipe 10 from the outside to the inside (in the direction of the arrow) due to the injection pressure of the resin during insert molding. At this time, since the filling 40 is filled in the cooling pipe 10, the injection pressure can be countered from the inside. However, since the filler 40 is, for example, spherical solid particles, some gaps are formed between the solid particles. At this time, when an injection pressure is applied to the cooling pipe 10, the outer wall surface of the cooling pipe 10 is slightly deformed along the gap between the fillings 40, and a plurality of recesses 13 are formed on the outer wall surface. obtain. As described above, in the present invention, it is permissible for the cooling pipe 10 to be deformed to some extent.

By forming the plurality of recesses 13 on the outer wall surface of the cooling pipe 10, the surface area thereof is improved, so that there is an advantage that the cooling efficiency of the cooling pipe 10 is improved. In particular, since the recess 13 is formed by the injection pressure of the resin, the resin is in close contact with the recess 13, and there is almost no void between the recess 13 and the resin. Therefore, heat can be efficiently transferred between the cooling pipe 10 and the resin layer 30. Therefore, for example, it is possible to intentionally fill the cooling pipe 10 with a filler 40 having a slightly larger diameter to intentionally form a recess 13 in which the resin is closely adhered to the surface of the cooling pipe 10. In this way, the amount of deformation of the cooling pipe 10 can be controlled by adjusting the amount, size, and shape of the filling 40 to be filled in the cooling pipe 10.

Subsequently, another embodiment of the present invention will be described with reference to FIGS. 5 to 7. Regarding another embodiment, the same components as those of the first embodiment described above will be omitted from the description by giving the same reference numerals, and the description will be centered on a structure different from that of the first embodiment.

FIG. 5 shows a cross-sectional structure of the insert product 100 according to the second embodiment of the present invention. In the second embodiment, unlike the first embodiment described above, the insulating film 14 is formed on the surface of the cooling pipe 10. As the insulating film 14, the insulating film can be imparted by forming an oxide film by using, for example, anodizing. In addition, it is also possible to form the insulating film 14 by coating the surface of the cooling pipe 10 with an insulating material such as PVC (vinyl chloride), fluorine (ETFE), polyethylene, nylon, or epoxy resin. By forming the insulating film 14 on the surface of the cooling pipe 10 in this way, even if the cooling pipe 10 and the heating element 20 both have conductivity, the distance between them is brought close to each other or they are brought into contact with each other. It is possible to place it. In this way, the heat dissipation effect can be improved by bringing the cooling pipe 10 and the heating element 20 closer to each other. In particular, if the insulating film 14 can be formed to ensure insulation in kV units, the cooling pipe 10 and the heating element 20 can be brought into contact with each other.

FIG. 6 shows a cross-sectional structure of the insert product 100 according to the third embodiment of the present invention. In the third embodiment, unlike the first embodiment described above, the heat transfer spacer 50 is interposed between the cooling pipe 10 and the heating element 20. The spacer 50 can be formed of a heat-conducting resin material. Further, in particular, when both the cooling pipe 10 and the heating element 20 are conductive, it is preferable that the spacer 50 has heat transfer property and insulating property. The spacer 50 may be integrated with the cooling pipe 10 and the heating element 20 by arranging the spacer 50 in the mold and injecting the molten resin to perform insert molding. By arranging the heat-conducting spacer 50 between the cooling pipe 10 and the heating element 20 in this way, for example, even if the resin forming the resin layer 30 does not have heat-conducting property, the cooling pipe 10 is used. The heat of the heating element 20 can be dissipated. As a result, the range of selection of the material forming the resin layer 30 is widened. Also, as described, for example, with reference to FIGS. 3 (b) and 3 (c), generally, a gap between the cooling pipe 10 and the heating element 20 is maintained in the cavities of the molds 210 and 220. It is preferable, but by using the spacer 50, the spacer 50 can be arranged between the cooling pipe 10 and the heating element 20 instead of this gap. When maintaining a gap between the cooling pipe 10 and the heating element 20, there may be a problem that a defective product may occur if the gap is not properly filled with the molten resin. However, by using the spacer 50, such a problem may occur. The occurrence of defective products can be suppressed.

FIG. 7 shows the insert product 100 according to the fourth embodiment of the present invention. 7 (a) is a plan view of the insert product 100, FIG. 7 (b) shows the cross-sectional structure of the line AA shown in FIG. 7 (a), and FIG. 7 (b) shows the cross-sectional structure. The cross-sectional structure of the BB line shown in FIG. 7A is shown. In the present embodiment, as a change from the first embodiment, the cooling pipe 10 is formed with the first cross-sectional shape portion 15 and the second cross-sectional shape portion 16, and each cross-sectional shape portion 15, 16 is configured so that the cross-sectional shape is different. Specifically, the first cross-sectional shape portion 15 is formed in a circular cross section, and the second cross-sectional shape portion 16 is formed in a quadrangular cross section. As described above, the cooling pipe 10 does not need to have a uniform cross-sectional shape as a whole, and the cross-sectional shape can be appropriately changed.

Specifically, in the present embodiment, in the cooling pipe 10, the first cross-sectional shape portion 15 having a circular cross section is arranged around the curved portion and around both ends (particularly, the portion extending from the resin layer 30). Has been done. On the other hand, in the portion between the first cross-sectional shape portions 15, the second cross-sectional shape portion 16 having a quadrangular cross-section is arranged. In particular, the second cross-sectional shape portion 16 is arranged on the heating element 20, and is arranged in the vicinity of the heating element 20 or in close contact with the heating element 20. As described above, by providing the second cross-sectional shape portion 16 having a quadrangular cross section on the heating element 20, the contact area between the heating element 20 and the cooling pipe 10 can be increased, so that the cooling efficiency can be improved.

In the above embodiment, it has been described that the cooling pipe 10 and the heating element 20 are mainly integrated by insert molding and embedded in the resin layer 30. However, in the present invention, in addition to these cooling pipes 10 and heating elements 20, various semiconductor parts, electronic parts, fasteners, and other functional parts can be embedded in the resin layer 30 by insert molding. Naturally.

As described above, in the present specification, in order to express the content of the present invention, the embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to the above embodiment, and includes modifications and improvements which are obvious to those skilled in the art based on the matters described in the present specification.

10 ... Cooling pipe 11 ... Embedded part 12 ... Extension part 13 ... Recess 14 ... Insulation film 15 ... First cross-sectional shape part 16 ... Second cross-sectional shape part 20 ... Heating element 21 ... Embedded part 22 ... Extension part 23 ... Opening 24 ... Hole 30 ... Resin layer 40 ... Filling 50 ... Spacer 100 ... Insert product 210 ... First mold 211 ... Gate 220 ... Second mold 230 ... Cap

Claims (4)

The process of filling the cooling pipe with filling and
The step of integrating the cooling pipe filled with the filling and the heating element by insert molding is included.
The filling is a method for manufacturing an insert product containing solid particles made of ceramic or metal. The production method according to claim 1 , wherein the solid particles include spherical solid particles. The manufacturing method according to claim 1 or 2 , further comprising a step of applying vibration to the cooling pipe after the filling step and before the integrating step. With a cooling pipe
With a heating element,
Have a resin which integrally coupling the cooling pipes and the heating element,
A plurality of recesses are formed on the outer wall surface of the cooling pipe.
An insert product in which the resin is in close contact with the recess.

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